Combined gear powered bulldozer and hoist



July 18, 1939. T. lP. FLYNN TAL COMBINED GEAR FOWERED BULLDOZER AND HOIST Filed Sept. l 13. 1957 4 Sheets-Sheet l July 18, 1939. T. P. FLYNN ETAL 2,166,105

` COMBINED GEAR POWERED BULLDOZER AND LOIST Filed Sept. l5, 1937 4 Sheets-Sheet 2 IN VEN TOR.5

Judy 18, 1939.` T. P. P LYNN Er Ax.

COMBINED GEAR POWERED BULLDOZER AND HOIST Filed sept.` 1s. 1957 4 sheets-sheet s INVENToRs July 18, l939 T.-`P. FLYNNE-r AL 2,156,105

COMBINED GEAR POWERED BULLDOZER AND H OIST l Filledl sept. 1s, 193'? 4 sheets-sheet 4 INVENToRs. THEODOR l? fZY/YN.

ATTORNEYS.

.Patented JulylS, 1939 l UNITED STATES PATENT! 'o v1,166,105 Fries IST Theodore r. Flynn ma Raymond E. Nens, rm-

land, Oreg.; dedicated tothe free use of the People of the United States of America Application september 13, 1937, serial Ne. 163,642'

4Claims.

.- (Granted under .the act of March 3, 1883, as

'Ihis application is made under the' act of March 3, 1883, as amended by the act of April 30,

payment to us of `any royaltythereon.

ing device attached to a'conventional tractor and has for an important object, a combination hoist and bulldozer machine, where the hoist is built in and combined with the bulldozer power mechanism. y

Another object of this invention is to provide, with the combination' of a hoist and bulldozer mountedon the same tractor.' an. arrangement whereby a. conventional tractor. can be made a Apurposeful machine.

Other objects are to provide an arrangement of geared power, clutching and braking mechanism to lfurnish 'power up' and down, to hold .with a brake andv also permit full floating and all other necessary movements and positions vfora bu11dozer-fblade; also, to furnish motion, power and braking toa. hoisting drum unitat 'the rear 4 of the tractor.

,Still another object is to provide a drum hoist- `ing unit of one or twodrums with no braking or clutchlngapparatus builtin or attached directly y to the hoisting drum or drums. -'Ihe advantages gained by elimination of -a braking and clutching apparatus directly attached to lthe hoisting drums are, that greatercable space isl provided and the heat usually generated vfrom brake bands and clutches as used on conventional hoist drums is' completely eliminated, and the total weight of the drum hoisting unit is reduced. This is a distinct advantage in the operation and use of the tractor, because the elimination ot weight on a drum hoisting apparatus, which is usually mounted on and projects from the rearof.the tractor, permits better balance and reduces the rear terminal heaviness found on the conventional type of hoisting "units now in use.

And still another object is, that by combining a hoist and bulldozer power'apparatus, a considerable reduction in total weight is accomplished as against any of the present conventional hoist and bulldozer arrangement where the hoist and bulldozer and their power transmitting apparatus is not related and is constructed separately, mounted independently, and driven with separate power transmitting apparatus. A further object is to' provide in aunit combination, a gear and 'clutch power transmitting arrangement that -willj provide reversible direcrlllellded Apl'll 30s-19.2.8; 37 o. G. 75.7)

tion power for a bulldozer unit, and by shiftingv one gear, the same power transmitting arrangement provides the necessary power and motion Y for a single or double drum hoisting unit' at the rear of the tractor.

A still further object is to provide, through an automatically operated holding brake, a feature whereby the back lash and shock from the bulldozer blade is not delivered to any of the power transmitting mechanism. All back lash' and shocks that are not absorbed by the shock springs attached to the bulldozer frame isa'rrested iinmediately and absorbed in the automatic holding wbrake. This feature gives longer life to the Ipower transmitting apparatus, and insures it against wear and breakage from. shock. This automatic holdingbrake also provides a. positive holding device which'is lautomatically andinstantaneously applied when lthe bulldozer blade is stunned in any position, 'and when applied, this brake gives instant relief-to the 'power transmit.- ting apparatus which elevates or lowers the blade. Still further objects are to provide a complete power transmitting, clutching, and braking combination built into one unit that provides the following operating features: Reversible power, holding .and iloating for a bulldozer blade; power,- motion, and a holding brake for-the drum hoisting apparatus at therear,'and since the braking for the hoist at the rear isv applied from the" -bulldozer clutching and power transmitting units onv this invention, through geared connections. to

said` drum lat the rear.: the braking leverage o n.

the'drum hoist'is greatly increased through this geared connection which'perniits the use -of a much smaller and more economical braking unit for the rear hoist, drums, 'and braking applied to the rearhoists requires much less eiiort on the part ofthe operator and results in much less strain and wear on the braking apparatus throughout than is the case of the direct brak-4 ing principle now in general use on heavy duty hoists. ,i

Another and further object is to provide the arrangement and combination of a geared type bulldozer yhoist power transmitting unit that is positive and instantaneous in its engagement and operation, that will be an improvement on the Y present conventional types of bulldozer lifting apparatus.

'Ihe above brief description of the power transa one lever control for the operator, which lever connected toa'nd through an arrangement of automatically operated linkage, and puts into motion the following power an'd braking applications: Power for operating the bulldozer' blade up and down, power to the hoist at the rear, brake engagement` and release to the hoist at the rear, and brake engagement and release for the main braking device of the bulldozer blade. All these movements and applications of power and braking are obtained by three distinct positions of one control lever, namely, forward, backward, and neutral.

Still another and further object is to provid a tilting device for the ends of the bulldozer blade, which device can bev operated from the drivers position. rI'he feature of this device as used on this gear powered bulldozer is, that all blade and tilting operations are performed with power for operating the bulldozer blade both up and down.

The following specification, consideredI together with the accompanying drawings, will fully disclose this invention, its arrangements, combinations, and operations of parts, and further objects and advantages thereof will be apparent.

In the' drawings:

Figure 1 is a side view of the mechanism for elevating and lowering a bulldozer blade and driving a hoisting drum as applied to a tractor.

Figure 2 is a plan view of the mechanism for elevating and lowering thebulldozer blade and driving a hoisting drum.

Figure 3 is a vertical sectional view through the planetary unit with the sliding gear in position for applying powerdownward on the bulldozer blade.

Figure 4 is alvertical sectional view through the planetary unit with the sliding gear in position for applying power to the hoisting drum.

Figure 5 is the vertical sectional view through the planetary unit with a sprocket clutch in position for applying power to elevate the bulldozer blade.

Figure 6 is a vertical sectional view through the planetary unit with the sprocket clutch in disengaged position when power is being applied to the hoist drum.

Figure 7 is a side view showing relative positions of the sliding gear and the driven gears.

Figure 8 is a vertical part section view of the eplanetary unit, hereinafter designated by the numeral 6, showing the extended hubl of a sun pinion which serves as a bearing for a shaft line extension, hereinafter designated by the nu-g meral 8A.

Figure 9 is a side view of the operating mechanism frame support showing oating lever and spring anchor.

Figure 10 is a side view of the operating mechanism with supporting members removed and showing brake band arrangement for transmitting power fory downward motion of bulldozer blade and also to hoisting drum.

Figure 11 is a side view of the lifting planetary power unit showing the brake band arrangement for applying power. forlifting the bulldozer blade.

f Figure 12 is a side view of a quick-cooling brake drum.

Figure 13 is a side view of a brake shoe application in' connection with a quick cooling brake drum shrunk on the brakeband surface of a Referring with more particularity to the drawings in which like numerals designate like parts. the bevel gear I is keyed to the power take of! shaft of the tractor and transmits the power tc the bevel gear 2, which last mentioned gear 2 is keyed to a shaft (not shown) directly below shaft 4. Spurgear 3 is keyed to shaft 4 and receives its power from a spur gear (not shown) directly beneath it on the same shaft to which the beveled gear 2 is keyed thus delivering power to the shaft 4. The said shaft 4 isrotatably mounted in the bearings 1-1--1 and terminates about midway of the lifting sprocket clutch 8. From that terminal point this shaft line is extended to bearing 1A by shaft 8A. Mounted on the main shaft 4 are two planetary units 5 and 6. The planetary unit `5, through the sliding spur gear 9 engages spur gear Ill mounted on shaft II,',said shaft II beingrotatably mounted in the bearings I2 l2. A driver sprocket I3 ,is

of eliminating slack in the drive chains I4 and I9, adjustable idlers are provided, such as the idler 29 shown in connection with chain I4. A

similar idler may be provided for chain I9. An"

other driver sprocket IB is keyed to the shaft 8A between the clutch 8 and the bearing 1A.

- Said clutch 3 is composed of two interlocking parts. one of which is proximate to the planetary gear unit 6 and rigidly attached thereto, and the other part is keyed to the end of said shaft 8A.

The said sprocket I8 is connected with another driven sprocket 20 by means of the transmission chain I9, above mentioned. This driven sprocket is keyed to the shaft ISA, which shaft is mounted in v:ailignmentwith shaft I6 in the bearings 20A 20A. The clutch 2l, similar to the clutch I, is composed of two interlocking parts one of which is keyed to the end of the shaft ISA, while the other interlocking part is keyed to the end 0f the shaft I6 with an axial sliding t. lThis clutch is used in connection with tilting the bulldo'zer blade, hereinafter more fully explained.

The racks 22 22 are suitably fastened to connecting members 23 23 having a pin connection to the bulldozer blade stirrups 59. The/connecting members 23, 23 are also connected to the blade holding pusharms 59A (the connecting means being not shown) and said pusharms 59A being pivoted to the bulldozer at 59B, one onfeither side of the bulldozer (only one shown). The directions of travel of said racks 22 22 are determined by the guide wheels 24 24, which guide wheels also serve to keep proper contact between said racks and their respective pinions IIA. These rack pinions through movements of A -the shafts I3 and IGA transmit power for elevating or lowering the bulldozer blade. A chain or other flexible means 30 is provided to limit the travel of said racks' so that they will ynot disengage the pinlons IIA. The .brake wheel I1 is normally withheld from rotating by a conventional brake` band IIB peripherally mourited thereon, this holding position being accomplished by the contraction of said brake band around said brake wheel by the force of the action of the spring 66. This position is automatically maintained when the operating lever 3l is in its neutrai position. When said lever 3| is out of its 1I neutral position. the said brake band is made to release its hold on the brake wheel l1 by means of a linkage system connecting said lever with said brake band.

By means of the lever 25, the sliding gear I can be disengaged from the gear II and engaged with the drum gear 25, which drum gear is keyed to the shaft 21 and which shaft is mounted in the bearings 2I 23. In conjunction with this operation, the clutch I is thrown out of engagement, permitting operation of the drum.

tively,- which shafts are press-fitted into the disc 6l or secured thereto by any other suitable means.

, The hun of the sun pinion Il is extended over a bushing G2 on the shaft IA. Another bushing 62A is mounted on the extended hub of the sun pinion 60 upon which the disc Il is rotatably mounted. The hub of sun pinion II is Valso extended in the opposite direction to receive a bushing 14 upon which the -drum wheel I3 is mounted. Said drum wheel 53 is provided with an internal ring gear 15 in .constant mesh with the planet pinions 12. When no braking force is applied to the drum wheel 63, so that it is free to rotate on the bushing 14, the shaft 4, which in operation is vvconstantly rotating, rotates the sun pinion 60 which in turn causes the planet pinions 12 to rotate about their respective shafts 13. These planet pinions, being in constant mesh with the ring gear 15 cause the wheel 53 to rotate. Normal frictional forces prevent the planet pinions from revolving about the sun pinion 5I. However, when rotation of the drum wheel I3 is arrested by clamping a brake band around it. the planet pinions must not onlyv rotatejon their respective axes but they must also revolve aboutthe sun pinion 5I, because they are constrained and the relative movement between them and the disc 53 must be maintained. As the planet pinions.. revolve they carry with them, the disc 5| to which one-half of the clutch I is attached.

Figures 3 and 4 illustrate the type of planetary gear unit used at 5. which is similar to that Aused at 5 except that the Vshaft 4 extends all the way through the assembly, substantially as shown. Also instead of mounting the drum wheel l 16 which is similar to the disc Il in Figures 5,

6, and 8, on an extension of the hub of the sun pinion 11, it is mounted directly on a bushing 18 of the shaft 4.

To -provide sumcient braking surface where space will not 'permit the conventional flat cy lindrical braking surface, a beveled surface may be employed as shown in Figure 14, consisting of an inner band I1, an outerV beveled braking when constant braking application is required easier operation is accomplished. Due to constant application .of the brake a certain amount of heat of friction is generated which, in some cases. becomes excessive. To dispose of this excessive heat the ribs 41 are employed to provide a space between the bands 45 and 46. Due

to the rotation of these parts' an increased amount of air-flowV is created over a greater cooling surface, thereby cooling` the brake band 46 more quickly. Another feature accomplished with a band of this type is the possibility of using two planetary units 'of the same size and gear ratios and place this band on the planetary unit have ing the heavier duty to perform, thereby increas-4 ing braking leverage.

mentioned assembled. This figure also illustrates the braking medium of two shoes 48 48 instead of the tensional band such as the member 1| shown in Figure 1'4. The said shoes 48 48 are fastened to scissor-type lever arms 49 49 fulcrumed at shaft 50; Pressure is applied by the bell crank 5i which has a oating fulcrumat lug 52 and a lever arm connection with adjustable link 53, anchored at the lug 54. 'I'he link 55 connects the bell crank 5| with thelever 56,

-whlch'lever is keyed to the shaft 5 0. The lever `arn1 51 is also keyed to the shaft 50 and has the same function as lever arm 34 in Figure li'i.A By reversing the positions of the bell crank 5l,

link 55, and lver 56 to the other side ofthe drum from that shown in Figure 13, .the movement of arm 51 in the opposite direction would function to apply the brake shoes 48 48. Reversing these connections', fulcrum point 52 changes to point 54, and the ,anchor point of the adjustable connection 53 changes from 54 to 52. 'Such a reverse movement is necessary when making application to twol separate planetary units from a single shaft operation. The spring 53 is compressibly mounted and holds the brake yshoes -away from the brake drum when released.

Referring with more particularity to Figure 10, the operating lever 3| is fulcrumed at thebracket' 33, said bracket being secured at a convenient point on the frame of the tractor, such as a fgnder. The lower corner of the bell crak 35 is attached near the fulcrum of said lever by means of an adjustable connecting rod. The bell crank 36 is fulcrumed at 31, to a bracket 31A of the main supporting bracket 31B. :The arm 34 is keyed to shaft 35 and pivotally mounted to the upper corner of the bell crank 36. The anged member 35A is\ also keyed to shaft 3l. The 'terminal ends of thebrake band of the planetary unit 5 is connected tothe member 35A, substantially as shown in Figure 10. Simi- 'lar brakingmeans are provided for the planetary unit I (Figure 1l), except that the member 35B is keyed -to the shaft 35, substantially perpendicuiarly tov member. 35A, and members connecting it to the brake band terminals are interchanged.

The linkage system in reference to the brake I1 is built `up'of a flanged member'4IA keyed t0 a shaft-fmember 4IB. to which are connected the brake band terminals of brake-I1 similar to that pertaining to the planetary'gear unit 5. One end of each of adjustable connecting links 3I and 38A are nivotally mounted on the lever 3l,

zo The Figure 13 illustrates a. planetary unit with a quick cooling brake drum of the type above` the link 38 being below the fulcrum, and the link 38A being above the fulcrum. These two links cross each other and are pivotally connected to the bent lever v39 at theirintersecting point by means ofthe pin 39A. The link 38A is further provided with a slotted section effecting a restricted sliding contact with the pin 39A. The other end of the link 38A is free while the other end of the link 38 is pivotally secured to the member MA, substantially as shown in the drawings. The link 4I is substantially parallel to the vertical arm of the bent lever 39 and has one of its ends keyed to the shaft IIB, While the other end is connected to said lever 39 below its fulcrum by means of the connecting link Il.

The operation of this invention is as follows:

Bevel gear i receives power from a power shaft (not shown) of the tractor and through the bevel gear 2, a spur pinion (not shown), and spur gear 3, power is delivered to shaft 4. Sun pinions 60 and 11 of the two planetary units 6 and 5. respectively, being fixed to the shaft l, continuously rotate whenever the bevel gear I is actuated by the power shaft of the tractor. By moving the operating lever 3i toward the drivers Seat the arm 3l is raised and clamps the brake .band on planetary units and, at the same time, releasesn the brake band on the planetary gear unit 5. Since the shaft 4 is constantly turning, the act of clamping the band on the disc of the planetary gear 4'unit 5, which disc constitutes the internal gear of the planetary system, stops its motion. When this disc stops the planetary pinions instead .of just rotating around their own axesarealso forced to move around the internal gear; thereby rotating the clutch 8. 'I'his rota- A"tion transmitted to the sprocket i8 is usually in a counter-clockwise direction 4(when 1 viewed as in Figure 1) andfurnishesthe power for backward movement of racks 22 22, which in turn elevate the bulldozer blade.

When the operating lever 3i is pushed away from the operators seat, the arm 8l vis moved downward, clamping the brake band on the disc of the internal gear of the planetary unit 5.

Consequently, the sliding gear 8 rotates in a counter-clockwise direction, which motion is transmitted to sprocket I8, furnishing power for movement of racks 22 22 for a downward movement of the bulldozerl blade.

A movement of operating lever 3| in either direction from its neutral position releases the band pressure onbrake wheel I'I so that there is no retarding by this brake wheel of the powered motion-directed to elevate or lower the bulldozer blade.y Whn the levers 25 and I3 are in the position shown in Figure 3 and Figure 5, respectively, their movements being correspondingly coordinated through the connecting link Il, the planetary unit 6-delivers power for raising the bulldozer blade -and the planetary unit delivers power for lowering the bulldozer blade. And, when lever and'lever 43 are in the opposite position as shown in-Figure 4 and Figure 6, respectively, the clutch 8 is separated so that no motion will be delivered to sprocket I8 and sliding gear 8 is moved to 'engage the gear 26 (Figure 2 and Figure 'n of the hoisting drum unit.

. With this arrangement itis not possible to use thebulldozer blade' actuating mechanism at the same time power is being applied to the drum hoisting unit.

To float the bulldozer blade for leveling operation, an extension 39A is provided on lever 39 (Figure 9) and is moveri to engage holding lug 65, thus making the brake wheel I1 free to move in either direction as determined by the floating movement of the bulldozer blade.

Having thus described our invention, we claim:

. 1. In a. bulldozer, a mechanism comprising two speed reduction and clutch planetary units disposed on opposite ends of a cross shaft, each of said units carrying an extended sun pinion and sleeve adapted for use as a bearing for Vsaid cross shaft and as a bearing for the driving half of the planetary unit. l

2. In a bulldozer, mechanism for actuating blade carrying pusharms, a power transmitting mechanism consisting of a divided cross shaft, a

clutch disengagedly connecting bothsegments of said cross shaft, two driven sprockets and two rack pinions keyed to said shaft, two racks cooperatively engaged-with said rack pinions, respectively, and a brake unit mounted onsaid cross shaft, all being cooperatively adapted to independently transmit power to said pusharmsand to hold said pusharms from movements relative to said bulldozer.

3. In a tractor, the combination of blade hold- I ing stirrups, lever arms secured to said stirrups',

racks secured to said lever arms, rack pinions keyed to a bisegmented cross shaft and cooperatively engaged with said racks, sprockets keyed to said cross shaftadapted' to receive power from the power plant of said tractor, a brake unit mounted on said cross shaft, and a clutch disthe power plant of said tractor, one of said planetary units being adapted by means of a slidable gear to transmit power and motion in one position to a hoisting drum disposed in the rear of said tractor and in another position to a. cross shaft adjacent to said planetary units, a sprocket keyed to said adjacent cross shaft, another cross shaft being substantially an extension of said first-mentioned cross shaft, a clutch adapted to couple said cross shaft with said extended cross shaft, a bisegmented pinion cross shaft parallel to said first-mentioned cross shaft, sprockets keyed to said pinion cross shaft adapted to receive power by flexible chain meansA from said adjacent shaft sprocket and said extended shaft sprocket, rack pinionscarried by said pinion cross shaft, a clutch adapted for.` engaging and disengaging the segments of said pinion cross shaft, braking means leyed to said pinion cross shaft and normally holding said cross shaft from rotay tion, racks engaging said rack pinions, means for mounting a bulldozer blade on said tractor, means pivotally connecting said racks to said bulldozer blade mounting means, and a single lever in connection with a linkage system for controlling the movements of all of said parts.-

' THEODORE P. FLYNN.

RAYMOND E. NEILS. 

